(1) Return string
(2)void
(3) Return to ModelAndView
// 把user对象存储到mv对象中,也会把user对象存入到request对象
mv.addObject("user",user);
// 跳转到哪个页面
mv.setViewName("success");
(4)
// 请求的转发
// return "forward:/WEB-INF/pages/success.jsp";
// 重定向
return "redirect:/index.jsp";
(5) ResponseBody responds to json data
<!--前端控制器,哪些静态资源不拦截-->
<mvc:resources location="/css/" mapping="/css/**"/>
<mvc:resources location="/images/" mapping="/images/**"/>
<mvc:resources location="/js/" mapping="/js/**"/>
public @ResponseBody User testAjax(@RequestBody User user){
@RequestBody User user: Accept json data
@ResponseBody User; encapsulate json data